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| UPDATED: 13:00, Fri, Feb 12, 2021 Link copied Sign up for FREE health tips to live a long and happy life SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they ll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. Most people have spells of dizziness and it s not usually serious - it can be attributed to dehydration or heat exhaustion. However, recurring spells of dizziness can signal postural tachycardia syndrome (PoTS) - an abnormal increase in heart rate that occurs after sitting up or standing, explained Dr Sara on This Morning. ....